docs: add comments

feat(wuu): more locs

fix(wuu): add fallback tone-map

docs: add acknowledgement

docs: add usage

feat: `easy-split`; `pron-font` default to `text.font`

feat: logo & attrs

feat: export in lib & typst package

chore: init package

docs: add README

feat: cmn-xghu

feat: `monospace` for `cd()`

feat: wuu-wugniu

feat(nan): support neutral tone (`--`)

refactor: separate code